Jo hann conrad hoscpt



UNITED STATES:

PATENT" O F E.

JOHANN CONRAD HtlSCH, OF VIENNA, AUSTRIA-HUNGARY.

PHOTOGRAPHIC PROCESS FOR PRINTING'INCOLO RS.

SPECIFICATION forming part of Letters Iatent No. 465,178, dated December 15, 1891.

Application filed J'uly 1'7, 1888- Serial No. 280,214. (No model.) Patented in England August 16, 1886, No. 10,483.

To all whom it may concern.-

Be it known that LJOHANN CONRAD HosoH, a citizen of the Empire of Austria, residing at Vienna, in the said Empire of Austria, have invented certain new and useful Improvements in a Photographic Process for Printing in Colors, (for which Patent No. 10,483 was issued to me in Great Britain August 16, 1886;) and I do declare the following to be a full, clear, and exact description of the invention, such as will enable others skilled inthe art to which it appertains to make and use the same.

My invention relates to a photographic process for printingincolors, by means of which said process exact colored copies of objects of all kinds, such as living objects, oil paintings, water-color paintings, and other colored original objects, can be produced.

As an example of how my process may be employed, let it be assumed that it is desired to reproduce a water-color painting in six different colors-that is to say, one yellow, one red, one blue, one gray, one flesh, and one intensifying or finishing color. In such case the process would be as follows: A photographic negative would be first taken from the original water-color drawing and from this original negative five glass positive pictures of exactly the same size would be made. These glass positives form the basis of the process of photographic color-printing. I next prepare the glass positives by means of transparent and opaque varnish colorsthat is to say, I apply the whole, half, and finer tints to such parts as are not to be seen, or only slightly to be seen, in each one of the above-named positive plates for the production of a faithful representation of the original color. I have then a corrected glass positive for each one of my colors, one each for the yellow, red, blue, and flesh colors and finishing tones. I now transfer the so-corrected glass positives in the ordinary photographic manner into glass negatives and retouch the so-inversed parts. I cover all the parts, surfaces, and lines which are reproduced on the glass positives just taken and not required for the special color-that is to say, the same parts which are stopped out in the negatives 'ture produced with these four colors.

for this plate, or the transformation into positive and negative is not necessary. I will then have a plate in which all has been obscured, but that which is to print or reproduce the yellow color, another in which all but that to reproduce the blue has been obscured, and so on throughout the entire plates. WVhen the negatives are used for producing gelatine printing-plates and these plates are printed in the corresponding colors, the six single printings are produced. I copy these six negatives on gelatine prin ting-plates and print the sheet yellow by means of the plate provided with yellow color. This yellow print is now placed in the customary printing-press and printed with flesh color from the plate provided with this color. The sheet so printed with yellow and flesh colorsis again printed with the plate provided with red. This sheet, provided with the yellow, flesh, and red colors, is again printed with blue from the plate for the said blue color and the pic The so-prepared sheet is now printed with gray from the negative printing-plate containing the gray color and then with the tint applied to the last printing-plate for intensifying or finishing the colors so as to produce the com plete picture. 7

It will be evident from the foregoing that the successive printing of the sheet with the various negative plates provided with the appropriate colors will produce an exact copy of the original photograph in the colors of the natural object.

Having now particularly described and ascertained the nature of my said invention and in what manner the same is to be performed, I declare that what I claim is- The process herein described of printing in-colors whichconsists of the following steps: first, making a photographic negative from the original to be reproduced; secondly, producing from said negative as many glass posiquired from said printing-plates, substanr0 tives as there are colors to be printed; thirdly, tially as set forth. correcting said positives With transparent In testimony whereof I affix my signature in colors so as to represent the different colors presence of two Witnesses.

5 in the 0ri ina1- fourthly producin ne atives 7 from said corrected positives and st epping JOHANN CONRAD HOSCH out said negatives; fifthly, producing print- Witnesses: ing-plates from the stopped-out negatives; EDMUND JUssEN,

and, lastly, printing the different colors re- OTTO SCHIFFER. 

